LT1580/LT1580-2.5 7A, Very Low Dropout Regulator FEATURES DESCRIPTION n Low Dropout, 540mV at 7A Output Current The LT 1580 is a 7A low dropout regulator designed to n Fast Transient Response power the new generation of microprocessors. The drop- n Remote Sense out voltage of this device is 100mV at light loads rising to n 1mV Load Regulation just 540mV at 7A. To achieve this dropout, a second low n Fixed 2.5V Output and Adjustable Output current input voltage 1V greater than the output voltage, is n No Supply Sequencing Problems in required. The device can also be used as a single supply Dual Supply Mode device where dropout is comparable to an LT1584. Several other new features have been added to the LT1580. U A remote SENSE pin is brought out. This feature virtually APPLICATIONS eliminates output voltage variations due to load changes. n Microprocessor Supplies Typical load regulation, measured at the SENSE pin, for a n Post Regulators for Switching Supplies load current step of 100mA to 7A is less than 1mV. n High Current Regulators n The LT1580 has fast transient response, equal to the 5V to 3.XXV for Pentium Processors Operating LT1584. On fixed voltage devices, the ADJ pin is brought at 90MHz to 166MHz and Beyond n out. A small capacitor on the ADJ pin further improves 3.3V to 2.9V for Portable Pentium Processor TM n transient response. PowerPC Series Power Supplies This device is ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V supplies are available. , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation. TYPICAL APPLICATION Dropout Voltage Minimum Power Voltage 2.5V Microprocessor Supply 1.0 INDICATES GUARANTEED TEST POINTS 0C T 125C 2.5V/7A J 3.3V V V POWER OUT 7A + + 100m F TANT 330m F DATA SHEET LIMIT AVX TPS OS-CON LT1580-2.5 7 0.5 T = 125C 5V J V SENSE CONTROL 0.2A T = 25C + J GND ADJ 10m F TANT 0.1m F 1580 TA01 0 0 1 2 3 4 5 6 7 OUTPUT CURRENT (A) 1580 G03 1 MINIMUM POWER VOLTAGE (V) U ULT1580/LT1580-2.5 ABSOLUTE MAXIMUM RATINGS V Input Voltage ................................................ 6V Power Transistor POWER V Input Voltage ........................................... 13V LT1580C ........................................... 0 C to 150 C CONTROL Storage Temperature ............................ 65 C to 150 C LT1580I........................................ 40 C to 150 C Operating Junction Temperature Range Lead Temperature (Soldering, 10 sec).................. 300 C Control Section PRECONDITIONING LT1580C ........................................... 0 C to 125 C LT1580I........................................ 40 C to 125 C 100% Thermal Limit Functional Test PACKAGE/ORDER INFORMATION ORDER PART ORDER PART FRONT VIEW FRONT VIEW NUMBER NUMBER 5 V POWER 5 V POWER 4 V CONTROL 4 V CONTROL TAB TAB IS 3 V IS 3 V OUT OUT LT1580CQ LT1580CT OUTPUT OUTPUT 2 ADJ 2 ADJ LT1580IQ LT1580IT 1 SENSE 1 SENSE Q PACKAGE T PACKAGE 5-LEAD PLASTIC TO-220 5-LEAD PLASTIC DD q = 30 C/ W q = 50 C/ W JA JA ORDER PART FRONT VIEW ORDER PART FRONT VIEW NC NUMBER 7 NUMBER 7 NC V 6 POWER 6 V POWER TAB ADJ 5 TAB 5 ADJ IS 4 V OUT IS 4 V OUT V OUTPUT 3 CONTROL OUTPUT 3 V CONTROL LT1580CR-2.5 LT1580CT7-2.5 2 GND 2 GND SENSE 1 1 SENSE LT1580IR-2.5 LT1580IT7-2.5 T7 PACKAGE R PACKAGE 7-LEAD PLASTIC TO-220 7-LEAD PLASTIC DD q = 30 C/ W q = 50 C/ W JA JA Consult factory for Military grade parts. (Note 1) ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage: LT1580-2.5 V = 5V, V = 3.3V, I = 0mA 2.485 2.500 2.515 V CONTROL POWER LOAD V = 4V to 12V, V = 3V to 5.5V, I = 0mA to 4A l 2.475 2.500 2.525 V CONTROL POWER LOAD V = 4V to 12V, V = 3V to 5.5V, 2.475 2.500 2.525 V CONTROL POWER I = 0mA to 7A, 0 C T 125 C LOAD J V = 4V to 12V, V = 3V to 5.5V, 2.460 2.500 2.525 V CONTROL POWER I = 0mA to 6.5A, 40 C T < 0 C LOAD J Reference Voltage: LT1580 V = 2.75V, V = 2V, I = 10mA 1.243 1.250 1.257 V CONTROL POWER LOAD (V = 0V) V = 2.7V to 12V, V = 1.75V to 5.5V, I = 10mA to 4A l 1.237 1.250 1.263 V ADJ CONTROL POWER LOAD V = 2.7V to 12V, V = 2.05V to 5.5V, 1.237 1.250 1.263 V CONTROL POWER I = 10mA to 7A, 0 C T 125 C LOAD J V = 2.7V to 12V, V = 2.05V to 5.5V, 1.232 1.250 1.263 V CONTROL POWER I = 10mA to 6.5A, 40 C T < 0 C LOAD J Line Regulation: LT1580-2.5 V = 3.65V to 12V, V = 3V to 5.5V, I = 10mA l 13 mV CONTROL POWER LOAD LT1580 V = 2.5V to 12V, V = 1.75V to 5.5V, I = 10mA l 13 mV CONTROL POWER LOAD 2 U W U U U U W U WW